I'm trying to connect a 3rd party analog voltage controller to an older DP panel. The model # of the panel is IT3 120-4 EDP I1 120-2 DP-8. I have 4 control conductors coming out of the panel, Red, Black, White, Blue. Any chance someone knows what these wires are meant for, control-wise? If I can find out what color wire is meant for what, I can program my voltage controller to work with the panel.

Thanks in advance!

Matt G.